(n) the sound made by the first piece of a two piece poo as it hits the toilet water, immediately followed by the sound 'plop' as the 2nd piece hits the water. Often results in a bit of toilet water shooting up your bum-hole because it hasn't had enough time to close up after the 2nd piece of poo fell out. Can have its benefits as it can have the same effect as using a bidet ...... of course this actually depends on where the event actually happens during the process of your poo !